As iPhone features differ from that of an Android phone, so will the features on Facebook for iPhone users differ from that of the Android users. So iPhone users/owners, this is for you!Android users, don't worry, we've got your back! Read this: How to create a public event on Facebook

ON YOUR FACEBOOK APPLICATION:

Tap on the menu button at the bottom right of your Facebook page

Scroll down and tap on "Events"

On the pop-up screen, tap on "Create" at the top of the Facebook page

On the top of the page, tap on the drop-down button to choose between a "Private" or "Public" event (the default setting is "Private event" so tap on it and change it to "Public event")

Fill in the Event title and tap on the photo icon by the right to add a photo for the event

If you are an admin in any page, you can allow the page to stay as the "Host", (the page will automatically appear as host), if you decide otherwise, just tap on "Host" to change it to your preference